Improvement in spikes



J. I. ADGATE.

Spike's.

N0. 158,665. Patent'd Jan, 12,1875.

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WITNESSES I iNVEN'II'OR v fi c r levs UNITED STATES PATENT OFFICE.

JOSEPH J. ADGATE, OF STEVENSVILLE, NEW YORK, ASSIGNOR OF THREE- I FOURTHS HIS RIGHT TO JOHN MAITLAND, J. H. STERNBERGH, AND

CALEB WHEELER, OF READING, PENNSYLVANIA.

- IMPROVEMENT IN SPIKES.

Specification forming part of Letters Patent No. 158,665, dated January 1'2, 1875; application filed 1 December 12, 1874.

the State of New York, have invented certain new and useful Improvements in-liock-Spikes; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings,;and to the letters of reference marked thereon, making'a'part of this specification. The natureof my invention consists in the construction of alspirally-twisted spike, as hereinafter more fully described.

:In the accompanying drawing, Figure 1 rep resents a perspective view of my spike. Fig. 2 represents a plan view of the head of the spike,

showing in dotted lines the shank of the spike thereunder. Fig. 3 represents a side elevation of the upper part of the spike.

B represents the spike, which. is made concave on all four sides from its point to within 7 a short distance of its head, and is spirally twisted from the point of thespike t0 the head thereof, as shown. Thev head 0 of the spike is of uniformdiameter, and centrally in axialline with the shank, and is beveled inward from top to bottom.

This spike is to be used with a plate or the web of a railroad-rail, having a square or elongated opening.

In connecting railroad-rails to the ties, it is es pecially of advantage, as the spike, when once driven in, cannot be withdrawn unless the rail turns or the spike is turned. By having the cad beveled, a space is left under which to insert a claw. As pressure is brought to bear on the claw the spike will revolve within the same, and be withdrawn just as it was inserted or driven in.

What I claim is- The spike described, its shank formed of a rectangular eoncaved bar, twisted from its point to its head, and its head of equal diameter centrally in axial line with the shank,and beveled from top to bottom, all substantially as and for the purposes herein set forth.

In testimony that.I claim the foregoing I have hereunto set my hand this 10th day of December, 1874.

JOSEPH J. ADGATE.

Witnesses:

O. M. ALEXANDER. H. A. HALL. 

